CN101776435A - Dielectric-capacitance testing method of deformation degree of transformer winding - Google Patents
Dielectric-capacitance testing method of deformation degree of transformer winding Download PDFInfo
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- CN101776435A CN101776435A CN201010033321A CN201010033321A CN101776435A CN 101776435 A CN101776435 A CN 101776435A CN 201010033321 A CN201010033321 A CN 201010033321A CN 201010033321 A CN201010033321 A CN 201010033321A CN 101776435 A CN101776435 A CN 101776435A
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Abstract
The invention provides a dielectric-capacitance testing method of the deformation degree of a transformer winding, belonging to the technical field of test of electric appliance components. The deformation degree of the transformer winding is judged by testing the variation of the dielectric loss and capacitance of the transformer winding. The invention has the advantages that shortage of the prior art is overcome, the deformation degree of the transformer winding is judged by testing the variation of the dielectric loss and capacitance of the transformer winding, the deformation degree of the transformer winding can be accurately judged by an overall dielectric-capacitance method or an interphase dielectric-capacitance method or by complementation and confirmation therebetween so that the repair the operating state of the transformer can be timely and accurately monitored, normal and safe operation of the transformer is ensured, and the working quality and the efficiency of the transformer are improved. The method is particularly suitable for testing the deformation degree of the transformer winding with the voltage of 110kV or above.
Description
Technical field
The present invention relates to the technical field of measurement and test of electrical structure parts, particularly a kind of dielectric-capacitance testing method of deformation degree of transformer winding that is applied to electric system judgement voltage levels.
Background technology
At present, the method for testing of domestic electric system diagnosis deformation degree of transformer winding mainly contains frequency response method and low-voltage short circuit impedance method.These two kinds of methods are subject to the field wiring mode and disturb and can not accurately judge the winding deformation position when judging deformation degree of transformer winding, and therefore certain limitation is arranged.
Adopt a kind of new method of testing by deformation degree of transformer winding in order accurately to judge---Jie's appearance method.Jie's appearance method is the variation by measuring transformer coil dielectric loss and electric capacity, judges the new method of deformation of transformer winding degree.The change of transformer coil proterties, distribution parameters such as its inductance, electric capacity, resistance also will change.Jie's appearance method is the size according to medium damage and electric capacitance change between transformer coil integral body and high, medium and low phase and phase, judges the position of winding deformation degree and winding deformation.
Summary of the invention
The purpose of this invention is to provide a kind of dielectric-capacitance testing method of deformation degree of transformer winding, it is variation by measuring transformer coil dielectric loss and/or electric capacity, to judge the deformation of transformer winding degree, utilize this method promptly to hold method by whole Jie's appearance method or alternate Jie, or replenishing mutually and confirmation by the two, can judge the deformation extent of transformer coil more exactly, judge and carry out the supervision and the maintenance of transformer running status timely and accurately, guarantee the normal safe operation of transformer, help improving the work quality and the efficient of transformer.Particularly suitable is used for the test of deformation extent of the transformer coil of 110kV and above electric pressure.
Technical scheme of the present invention is: a kind of dielectric-capacitance testing method of deformation degree of transformer winding, it is characterized in that it being variation by measuring transformer coil dielectric loss and/or electric capacity, and according to criterion, judge the deformation of transformer winding degree methods.
Described dielectric-capacitance testing method of deformation degree of transformer winding, when it is characterized in that measuring, can at first carry out between the high, medium and low winding of transformer and dielectric loss over the ground or electric capacity measurement, be that factory-said value or handing-over value compare with above-mentioned measured value and its initial value then, according to criterion, judge which electric pressure winding of transformer deforms and deformation extent, is called whole Jie's appearance method.
Described transformer electric capacity is measured and can be meant: C1 low pressure winding electric capacity over the ground, C
2In, the electric capacity between the low pressure winding, C
3Electric capacity between high, the middle pressure winding, C
4Middle winding electric capacity over the ground, the C of pressing
5High pressure winding electric capacity over the ground; C
H+M+LHigh, medium and low voltage winding electric capacity over the ground, C
H+MHigh, middle pressure winding electric capacity over the ground, C
HHigh pressure winding electric capacity over the ground, C
MMiddle winding electric capacity over the ground, the C of pressing
LLow pressure winding electric capacity over the ground, the formula that specifically the is calculated as follows 1-5 of measurement:
Formula 1, C
1=(C
H+M+L+ C
L-C
H+M)/2
Formula 3, C
3=(C
M+ C
H-C
H+M)/2
Formula 4, C
4(C
H+M+L+ C
M-C
L-C
H)/2
Described is that factory-said value or handing-over value compare and be meant with above-mentioned measured value and its initial value: when error during greater than a certain setting, think that promptly there is distortion in transformer, should strengthen operating supervision; When error during greater than another setting, think that promptly there is gross distortion in transformer, should or, should adopt an effective measure and strengthen operating supervision, should disintegrate at the scene or return factory and check.
Described whole Jie's appearance method criterion is: when over the ground electric capacity and initial value between each the high, medium and low winding that calculates and respectively is factory-said value or handing-over value error between ± the 3-6% time, transformer exists and is out of shape, and should strengthen operating supervision; When error greater than ± 7% the time, there is gross distortion in transformer, should return factory's maintenance.
Described dielectric-capacitance testing method of deformation degree of transformer winding, when it is characterized in that measuring, also can at first carry out the every alternate dielectric loss of high, medium and low winding and the measurement of electric capacity, measured value with above-mentioned dielectric loss and electric capacity carries out alternate comparison then, be about to above-mentioned measured value and carry out lateral comparison, according to criterion, judge the degree of which phase winding distortion of transformer, be called alternate Jie and hold method.
The measurement that alternate Jie holds described dielectric loss of method and electric capacity is, measures high pressure winding A, B respectively, C centering is pressed winding Am, Bm, Cm, and middle pressure winding Am, Bm, Cm are to low pressure winding a, b, c, and the low pressure winding is to the dielectric loss and the electric capacity of iron core;
The measured value that alternate Jie holds described dielectric loss of method and electric capacity carries out alternate comparison and can be meant: when error during greater than a certain setting, think that promptly there is distortion in transformer, should strengthen operating supervision; When error during greater than another setting, think that promptly there is gross distortion in transformer, should or, should strengthen operating supervision, should disintegrate at the scene or return factory and check.
The measurement that alternate Jie holds described dielectric loss of method and electric capacity can be with this mode of connection measures.
Alternate Jie holds the described criterion of method and can be meant: when the alternate error of electric capacity between ± the 3-6% and during dielectric loss greater than 0.8% the time, there is distortion in transformer, should strengthen operating supervision; When capacitance error greater than ± 7% and during dielectric loss greater than 1.2% the time, there is gross distortion in transformer, should return factory's maintenance.
Described dielectric-capacitance testing method of deformation degree of transformer winding, when it is characterized in that measuring, also can: carry out between the high, medium and low winding of transformer and dielectric loss over the ground or electric capacity are measured, the error amount that with above-mentioned measured value and its initial value is factory-said value or handing-over value then compares, according to criterion, judge which electric pressure winding of transformer deforms and deformation extent, is called whole Jie's appearance method; Simultaneously, also carry out the every alternate dielectric loss of high, medium and low winding and the measurement of electric capacity, the measured value with above-mentioned dielectric loss and electric capacity carries out alternate lateral comparison then, according to criterion, judge the degree of which phase winding distortion of transformer, be called alternate Jie and hold method; By replenishing mutually and confirmation of the two, more can judge the deformation extent of transformer coil more exactly, judge and carry out the supervision and the maintenance of transformer running status timely and accurately.Whole Jie's appearance method and alternate Jie hold the method concrete operations, all can be with above-mentioned.
The present invention has outstanding beneficial effect: it has overcome the deficiency of prior art, variation by measuring transformer coil dielectric loss and/or electric capacity, utilize this method promptly to hold method by whole Jie's appearance method or alternate Jie, or replenishing mutually and confirmation by the two, can judge the deformation extent of transformer coil more exactly, supervision and the maintenance of carrying out the transformer running status to adopt an effective measure timely and accurately, guarantee the normal safe operation of transformer, help improving the work quality and the efficient of transformer.Particularly suitable is used for the test of deformation extent of the transformer coil of 110kV and above electric pressure.
Be described further below in conjunction with drawings and Examples, but not as a limitation of the invention.
Description of drawings
Fig. 1 is an one embodiment of the invention three-winding transformer synoptic diagram.
Fig. 2 is the equivalent schematic of Fig. 1 transformer.
Embodiment
The implication of each symbol is described as follows: C with reaching herein among the figure earlier
1--low pressure winding electric capacity over the ground; Tan δ
1--low pressure winding dielectric loss over the ground; C
2--in, the electric capacity between the low pressure winding; Tan δ
2--in, low pressure winding dielectric loss over the ground; C
3--the electric capacity between high, the middle pressure winding; Tan δ
3--high, medium and low voltage winding dielectric loss over the ground; C
4--middle pressure winding electric capacity over the ground; Tan δ
4--middle pressure winding dielectric loss over the ground; C
5--high pressure winding electric capacity over the ground; Tan δ
5--high pressure winding dielectric loss over the ground; C
H+M+L--high, medium and low voltage winding electric capacity over the ground; Tan δ
H+M+L--high, medium and low voltage winding dielectric loss over the ground; C
H+MHigh, middle pressure winding electric capacity over the ground; Tan δ
H+M--high, middle pressure winding dielectric loss over the ground; C
HHigh pressure winding electric capacity over the ground; Tan δ
H--high pressure winding dielectric loss over the ground; C
MThe middle winding electric capacity over the ground of pressing; Tan δ
M--middle pressure winding dielectric loss over the ground; C
LLow pressure winding electric capacity over the ground; Tan δ
L--low pressure winding dielectric loss over the ground; A high pressure winding A phase, B high pressure winding B phase, C high pressure winding C phase; Press winding A phase among the Am, press winding B phase among the Bm, press winding C phase among the Cm; A low pressure winding A phase, b low pressure winding B phase, c low pressure winding C phase, O high pressure neutral point winding is pressed the neutral point winding among the Om, and Yn high pressure winding connection mode is pressed winding connection mode, d11 low pressure winding connection mode among the yn0; 1--high pressure winding is pressed winding among the 2--, 3--low pressure winding, 4--transformer core, 5--transformer case.
Jie's appearance method is to decrease and the size of electric capacitance change the position of judgement winding deformation degree and winding deformation according to medium between transformer coil integral body and between high, medium and low phase and phase.Jie's appearance method is divided into whole Jie's appearance method and alternate Jie holds method two parts.Whole Jie's appearance method judges which electric pressure winding of transformer deforms and deformation extent, and alternate Jie's appearance method is judged the degree of which phase winding distortion.Whole Jie's appearance method and alternate Jie hold method and all adopt the high voltage dielectric loss instrument of Schering bridge principle to measure, wherein whole Jie's appearance method is between the high, medium and low winding of measuring transformer and dielectric loss over the ground and electric capacity measurement, judges which electric pressure winding of transformer deforms and deformation extent.Alternate Jie's appearance method is to measure the every alternate dielectric loss of high, medium and low winding and the measurement of electric capacity, judges the degree of which phase winding distortion.
Be example with the three-winding transformer all below, carry out Jie's appearance method explanation that deformation degree of transformer winding is judged, do not press the winding test data during the two-winding transformer test data all has.Referring to Fig. 1～Fig. 2.
Embodiment 1: whole Jie's appearance method
The test wiring: surveying instrument adopts the high voltage dielectric loss instrument of Schering bridge principle, instrument adopts reversal connection line mode to measure, and test wiring and measuring point carry out high, medium and low, senior middle school, senior middle school's low-voltage coil respectively to other coil and ground medium decreases and the electric capacity measurement by table 1 wiring requirements.By five dielectric losses of the high, medium and low winding of transformer and the test data of electric capacity, calculate low pressure winding electric capacity over the ground respectively; In, the electric capacity between the low pressure winding; Electric capacity between high, the middle pressure winding; The middle winding electric capacity over the ground of pressing; High pressure winding electric capacity and dielectric loss over the ground.Variable quantity by these five dielectric losses and electric capacity and factory-said value carries out the judgement of that electric pressure winding deformation degree of transformer coil.The electric capacity and the dielectric loss at each position of transformer of test wiring and test are as shown in table 1:
Method test wiring of the whole Jie's appearance of table 1 transformer and test result
Data by transformer high, medium and low voltage winding dielectric loss and electric capacity test can calculate dielectric loss and electric capacity between transformer coil.Because integral medium loss reflection deformation of transformer winding degree is insensitive, generally do not convert, and electric capacity reflection deformation extent sensitivity need be calculated.Transformer coil integral capacitor amount is calculated C respectively
1Low pressure winding electric capacity over the ground; C
2In, the electric capacity between the low pressure winding; C
3Electric capacity between high, the middle pressure winding; C
4The middle winding electric capacity over the ground of pressing; C
5High pressure winding electric capacity over the ground.Specifically be calculated as follows formula 1-5:
Formula 1, C
1=(C
H+M+L+ C
L-C
H+M)/2
Formula 3, C
3=(C
M+ C
H-C
H+M)/2
Formula 4, C
4=(C
H+M+L+ C
M-C
L-C
H)/2
Whole Jie's appearance method criterion: when over the ground electric capacity and initial value (factory-said value or handing-over value) error between each the high, medium and low winding that calculates and respectively between ± the 3-6% time, transformer exists and is out of shape, and should strengthen operating supervision; When error greater than ± 7% the time, there is gross distortion in transformer, should return factory's maintenance.
Embodiment 2: alternate Jie holds method
In order accurately to detect which phase coil deformation extent of transformer, dielectric loss and electric capacity between the phase and phase of employing phase-splitting test winding, both measured middle relatively winding Am, Bm, the Cm phase of pressing of high pressure winding A, B, C respectively, middle winding Am, Bm, Cm relatively low pressure winding a, b, the c phase of pressing, the low pressure winding is to the dielectric loss and the electric capacity of iron core.The 110-220kV transformer major part of domestic operation of power networks is Yn, yn0, and the wiring of d11 point, high pressure winding voltage grade has two kinds of 110kV and 220kV, and middle pressure winding voltage grade has two kinds of 35kV and 110kV, and low pressure winding voltage grade has two kinds of 10kV and 35kV.Low pressure winding connection mode is to be connected into 11 modes of connection in transformer inside, and transformer is externally drawn a, b, c three-phase respectively.Therefore alternate Jie holds method and mainly considers to measure with this mode of connection.
With transformer high-voltage A phase winding, middle pressure Am phase winding and the test of low pressure a phase winding is example, and surveying instrument adopts the high voltage dielectric loss instrument of Schering bridge principle, and instrument adopts the positive mode of connection to measure, and test wiring and measuring point are undertaken by table 2 wiring requirement.The electric capacity and the dielectric loss at each position of transformer of test wiring and test are as shown in table 2:
Test wiring of the alternate Jie's appearance of table 2 transformer method and measuring point
In like manner, middle relatively winding Bm, the Cm phase of pressing of testing high voltage winding B, C, middle pressure winding Bm, Cm relatively low pressure winding b, c phase, the low pressure winding is to the dielectric loss and the electric capacity of iron core.By A, the B of same electric pressure winding, the lateral comparison between the C, judge the deformation of transformer winding degree.
Alternate Jie holds the method criterion: greater than 0.8% o'clock, there was distortion in transformer to the alternate error of electric capacity, should strengthen operating supervision between ± 3-6% and during dielectric loss; When capacitance error greater than ± 7% and during dielectric loss greater than 1.2% the time, there is gross distortion in transformer, should return factory's maintenance.
Claims (9)
1. dielectric-capacitance testing method of deformation degree of transformer winding is characterized in that it being variation by measuring transformer coil dielectric loss and/or electric capacity, according to criterion, judges the deformation of transformer winding degree methods.
2. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 1, when it is characterized in that measuring, at first carry out between the high, medium and low winding of transformer and dielectric loss over the ground or electric capacity measurement, the error amount that with above-mentioned measured value and its initial value is factory-said value or handing-over value then compares, according to criterion, judge which electric pressure winding of transformer deforms and deformation extent, is called whole Jie's appearance method.
3. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 2 is characterized in that the measurement of described transformer electric capacity is meant: C
1Low pressure winding electric capacity over the ground, C
2In, the electric capacity between the low pressure winding, C
3Electric capacity between high, the middle pressure winding, C
4Middle winding electric capacity over the ground, the C of pressing
5High pressure winding electric capacity over the ground; The formula that specifically the is calculated as follows 1-5 that measures:
Formula 1, C
1=(C
H+M+L+ C
L-C
H+M)/2
Formula 2, C
2=(C
L+ C
H+M-C
H+M+L)/2
Formula 3, C
3=(C
M+ C
H-C
H+M)/2
Formula 4, C
4=(C
H+M+L+ C
M-C
L-C
H)/2
Formula 5, C
5=(C
H+ C
H+M-C
M)/2
Described is that the error amount of factory-said value or handing-over value compares and is meant with above-mentioned measured value and its initial value: when error during greater than a certain setting, think that promptly there is distortion in transformer, should strengthen operating supervision; When error during greater than another setting, think that promptly there is gross distortion in transformer, should carry out strip inspection.
4. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 2, it is characterized in that described criterion is: when over the ground electric capacity and initial value between each the high, medium and low winding that calculates and respectively is factory-said value or handing-over value error between ± the 3-6% time, there is distortion in transformer, should strengthen operating supervision; When error greater than ± 7% the time, there is gross distortion in transformer, should adopt an effective measure and strengthen operating supervision, disintegrates at the scene or returns factory and check.
5. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 1, when it is characterized in that measuring, at first carry out the every alternate dielectric loss of high, medium and low winding and the measurement of electric capacity, measured value with above-mentioned dielectric loss and electric capacity carries out alternate lateral comparison then, according to criterion, judge the degree of which phase winding distortion of transformer, be called alternate Jie and hold method.
6. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 5, the measurement that it is characterized in that described dielectric loss and electric capacity is meant, measure high pressure winding A, B, C centering pressure winding Am, Bm, Cm respectively, middle winding Am, Bm, the Cm of pressing is to low pressure winding a, b, c, and the low pressure winding is to the dielectric loss and the electric capacity of iron core.
7. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 5, the measured value that it is characterized in that described dielectric loss and electric capacity carries out alternate lateral comparison and refers to: when error during greater than a certain setting, think that promptly there is distortion in transformer, should strengthen operating supervision; When error during greater than another setting, think that promptly there is gross distortion in transformer, should carry out strip inspection.
8. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 5, it is characterized in that described criterion is: when the alternate error of electric capacity between ± the 3-6% and during dielectric loss greater than 0.8% the time, there is distortion in transformer, should strengthen operating supervision; When capacitance error greater than ± 7% and during dielectric loss greater than 1.2% the time, there is gross distortion in transformer, should adopt an effective measure and strengthen operating supervision, disintegrates at the scene or returns factory and check.
9. dielectric-capacitance testing method of deformation degree of transformer winding according to claim 1, when it is characterized in that measuring, carry out between the high, medium and low winding of transformer and dielectric loss over the ground or electric capacity measurement, the error amount that with above-mentioned measured value and its initial value is factory-said value or handing-over value then compares, according to criterion, judge which electric pressure winding of transformer deforms and deformation extent, is called whole Jie's appearance method; Simultaneously, also carry out the every alternate dielectric loss of high, medium and low winding and the measurement of electric capacity, the measured value with above-mentioned dielectric loss and electric capacity carries out alternate lateral comparison then, according to criterion, judge the degree of which phase winding distortion of transformer, be called alternate Jie and hold method; By replenishing mutually and confirmation of the two, more can judge the deformation extent of transformer coil more exactly, judge and carry out the supervision and the maintenance of transformer running status timely and accurately.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997838A (en) * | 2012-11-20 | 2013-03-27 | 中国电力科学研究院 | Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics |
| CN106771645A (en) * | 2016-12-12 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
| CN108959840A (en) * | 2018-03-23 | 2018-12-07 | 国网河北省电力有限公司电力科学研究院 | A kind of calculation method, system and the terminal device of transformer Cooling efficiency |
| CN110030920A (en) * | 2019-05-17 | 2019-07-19 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of test method of deformation of transformer winding, device and storage medium |
| CN110030919A (en) * | 2019-05-17 | 2019-07-19 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of method of determining transformer winding width to deformation |
| CN110081809A (en) * | 2019-05-17 | 2019-08-02 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of method of determining transformer winding width to deformation |
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| CN114894083A (en) * | 2022-04-22 | 2022-08-12 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Method for judging deformation fault of double-winding transformer winding by adopting capacitance change |
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| CN102997838A (en) * | 2012-11-20 | 2013-03-27 | 中国电力科学研究院 | Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics |
| CN102997838B (en) * | 2012-11-20 | 2015-04-15 | 中国电力科学研究院 | Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics |
| CN106771645A (en) * | 2016-12-12 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| CN106771645B (en) * | 2016-12-12 | 2019-06-25 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
| CN108959840A (en) * | 2018-03-23 | 2018-12-07 | 国网河北省电力有限公司电力科学研究院 | A kind of calculation method, system and the terminal device of transformer Cooling efficiency |
| CN110081809A (en) * | 2019-05-17 | 2019-08-02 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of method of determining transformer winding width to deformation |
| CN110030919A (en) * | 2019-05-17 | 2019-07-19 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of method of determining transformer winding width to deformation |
| CN110030920A (en) * | 2019-05-17 | 2019-07-19 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of test method of deformation of transformer winding, device and storage medium |
| CN110030919B (en) * | 2019-05-17 | 2021-01-05 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Method for determining radial deformation of transformer winding |
| CN112902824A (en) * | 2021-01-20 | 2021-06-04 | 国网河北省电力有限公司 | Method for rapidly judging deformation of internal winding of main transformer equipment |
| CN114706018A (en) * | 2022-04-18 | 2022-07-05 | 云南电网有限责任公司电力科学研究院 | Transformer winding deformation monitoring system and method |
| CN114924209A (en) * | 2022-04-18 | 2022-08-19 | 云南电网有限责任公司电力科学研究院 | Transformer winding deformation monitoring system and method |
| CN114706018B (en) * | 2022-04-18 | 2024-09-24 | 云南电网有限责任公司电力科学研究院 | Transformer winding deformation monitoring system and method |
| CN114894083A (en) * | 2022-04-22 | 2022-08-12 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Method for judging deformation fault of double-winding transformer winding by adopting capacitance change |
| CN114894083B (en) * | 2022-04-22 | 2023-10-27 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Method for judging winding deformation fault of double-winding transformer by adopting capacitance change |
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